Occupational Safety and Health Administration

METHYL IODIDE†

Chemical Identification
CAS #	74-88-4
Formula	CH₃I
Synonyms	iodomethane; monoiodomethane

Physical Properties
Physical description	Colorless liquid with a pungent, ether-like odor.
Boiling point	109°F	Molecular weight	141.94
Freezing point/melting point	-88°F	Vapor pressure	400 mmHg
Flash point		Vapor density
Specific gravity	2.28	Ionization potential	9.54 eV
Lower explosive limit (LEL)	10%	Upper explosive limit (UEL)	15%
NFPA health rating	3	NFPA fire rating	0
NFPA reactivity rating	0	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	1772
Sampling group
Sampler/Sampling media	CSC tube (100/50 mg) [SKC 226-01]
Sampling time^*
Sampling volume (TWA)^*	15-50 L
Sampling flow rate (TWA)^*	0.01-1 L/min
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments	GC-FID
Method reference	NIOSH 1014 (partially validated)
Notes
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device	Infrared spectrophotometer	Detector tube
Model/Type	Miran 1A & 1B	Matheson-Kitagawa 8014-176S
Sampling information (see manufacturer instructions)	1.8 ppm@3.4µm	5-40 ppm range

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	5 ppm (28 mg/m³)	REL-TWA	2 ppm (10 mg/m³)	TLV-TWA	2 ppm [1978]	PEL-TWA	2 ppm (10 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	Y	Skin notation	Y	Skin notation	Y	Skin notation	Y
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes: CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION (LOQ 1.7 ppm). See Appendix A, NIOSH Potential Occupational Carcinogens.		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	100 ppm
Carcinogenic classifications: IARC-3, NIOSH-Ca		Notes: Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: 25 ppm/50 ppm/125 ppm

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methyl iodide

NIOSH: Pocket Guide to Chemical Hazards - Methyl iodide

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methyl iodide. See annual publication for most recent information.

Last Updated Date : 01/29/2021

METHYL CHLORIDE†

Chemical Identification
CAS #	74-87-3
Formula	CH₃Cl
Synonyms	chloromethane; monochloromethane

Physical Properties
Physical description	Colorless gas with a faint, sweet odor which is not noticeable at dangerous concentrations.
Boiling point	-12°F	Molecular weight	50.5
Freezing point/melting point	-144°F	Vapor pressure	5.0 atm
Flash point	-49.0°F	Vapor density	1.78
Specific gravity	0.997 at -11.2°F	Ionization potential	11.28 eV
Lower explosive limit (LEL)	8.1%	Upper explosive limit (UEL)	17.4%
NFPA health rating	2	NFPA fire rating	4
NFPA reactivity rating	0	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	1710
Sampling group
Sampler/Sampling media	2 CSC tubes in series (first tube 400/200 mg, second tube 100/50 mg) [SKC 226-09 & SKC 226-01]
Sampling time^*
Sampling volume (TWA)^*	0.4-3 L
Sampling flow rate (TWA)^*	0.01-0.1 L/min
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments	GC-FID
Method reference	NIOSH 1001 (fully validated)
Notes
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device	Detector tube	Detector tube
Model/Type	Gastec 51	Gastec 51L
Sampling information (see manufacturer instructions)	1 stroke, approx 10-480 ppm	1 or 2 strokes, approx 1-86 ppm

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	100 ppm (210 mg/m³)	REL-TWA		TLV-TWA	50 ppm [1992]	PEL-TWA	50 ppm (105 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL	100 ppm [1992]	PEL-STEL	100 ppm (210 mg/m³)
PEL-C	200 ppm; 300 ppm (Peak - 5 min in any 3 hrs)	REL-C		TLV-C		PEL-C	300 ppm
Skin notation	N	Skin notation	N	Skin notation	Y	Skin notation	N
Notes: Ceiling value applies only to OSHA General Industry standard. TWA applies to OSHA's General Industry and Maritime standards. See 29 CFR 1910.1000 Table Z-2 and 29 CFR 1915.1000 Table Z-Shipyards.		Notes: CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION (LOQ 1.6 ppm). See Appendix A, NIOSH Potential Occupational Carcinogens.		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	2000 ppm
Carcinogenic classifications: IARC-3, NIOSH-Ca, TLV-A4, EPA-D; CBD		Notes: Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: 150 ppm/1000 ppm/3000 ppm

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methyl chloride

NIOSH: Pocket Guide to Chemical Hazards - Methyl chloride

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methyl chloride. See annual publication for most recent information.
EPA Air Toxics Website: Methyl Chloride (Chloromethane). U.S. Environmental Protection Agency Technology Transfer Network.
Nelson, H.H., et al., Ethnic differences in the prevalence of the homozygous deleted genotype of glutathione S-transferase theta. Carcinogenesis 16(5): 143-1245, 1995.
No authors: Methyl chloride. IARC Monogr. Eval. Carcinog. Risks Hum. 71(Pt. 2): 737-747, 1999.
Pohanish, R.P. (editor): Methyl Chloride. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1537-1540.

Last Updated Date : 01/29/2021

ETHYLENE

Chemical Identification
CAS #	74-85-1
Formula	C₂H₄
Synonyms	ethene; acetene

Physical Properties
Physical description	Colorless gas with a sweet odor.
Boiling point	-154.7°F	Molecular weight	28.05
Freezing point/melting point	-272.4°F	Vapor pressure
Flash point	-213°F (approx)	Vapor density
Specific gravity	0.569 at -154.84°F	Ionization potential
Lower explosive limit (LEL)	2.75%	Upper explosive limit (UEL)	28.6%
NFPA health rating	2	NFPA fire rating	4
NFPA reactivity rating	2	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time^*
Sampling volume (TWA)^*
Sampling flow rate (TWA)^*
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments
Method reference
Notes
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device	Detector tube	Detector tube	Detector tubes	Detector tube	Detector tube
Model/Type	Dräger - Ethylene 0.1/a, 8101331	Dräger - Ethylene 50/a, 6728051	Gastec 172L, 172, 171	Matheson-Kitagawa 8014-108SA	Matheson-Kitagawa 8014-280S
Sampling information (see manufacturer instructions)	20 strokes, approx 0.2-5 ppm range; uncertainty 49%	3 strokes, approx 50-2500 ppm range, uncertainty 32%	172L: 1 stroke, 5-800 ppm range, uncertainty 16% for 25-200 ppm, 8% for 200-800 ppm. 172: 1 stroke, 5-800 ppm range, uncertainty 16% for 25-200 ppm, 8% for 200-800 ppm. 171: 1 stroke, 0.1-2% range. 103: 0.5-2 strokes, 0.35-16.8% range	follow mfr instructions, approx 20-1200 ppm range	follow mfr instructions, approx 20-2000 ppm range

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA		REL-TWA		TLV-TWA	200 ppm [2001]	PEL-TWA
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	NA	Skin notation	N	Skin notation	N
Notes: Ethylene is classified as a simple asphyxiant and exposure is addressed in OSHA Construction and Maritime standards only. For OSHA's construction regulations, see 29 CFR 1926.55 Table 1: [E] The limiting factor is the available oxygen which shall be at least 19.5% and be within the requirements addressing explosion in 29 CFR 1926. For OSHA's maritime regulations, see 29 CFR 1915.1000 Table Z-Shipyards: [E] The limiting factor is the available oxygen which shall be at least 18% and be within the requirements addressing explosion in 29 CFR 1915, Subpart B.		Notes: Not established		Notes:		Notes: See footnote [h]: A number of gases and vapors, when present in high concentrations, act primarily as asphyxiants without other adverse effects. A concentration limit is not included for each material because the limiting factor is the available oxygen. (Several of these materials present fire or explosion hazards.)
Health factors: See NIH-NLM PubChem.		IDLH
Carcinogenic classifications: TLV-A4		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Ethylene

NIOSH: Pocket Guide to Chemical Hazards - Ethylene

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Ethylene. See annual publication for most recent information.

Last Updated Date : 01/31/2018

METHYL BROMIDE†

Chemical Identification
CAS #	74-83-9
Formula	CH₃Br
Synonyms	bromomethane; monobromomethane

Physical Properties
Physical description	Colorless gas with a chloroform-like odor at high concentrations.
Boiling point	38°F	Molecular weight	94.95
Freezing point/melting point	-137°F	Vapor pressure	1.9 atm
Flash point		Vapor density	3.36
Specific gravity	1.73 (liquid at 32°F)	Ionization potential	10.54 eV
Lower explosive limit (LEL)	10%	Upper explosive limit (UEL)	16%
NFPA health rating	3	NFPA fire rating	1
NFPA reactivity rating	0	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	1680
Sampling group
Sampler/Sampling media	2 Anasorb 747 sampling tubes (6 mm glass tubes, the front tube contains 400 and the back 200 mg of sorbent) connected in series [SKC 226-82], tube holder [SKC 222-3L-1], Type D cover [SKC 224-29D]
Sampling time^*	60 min
Sampling volume (TWA)^*	3 L
Sampling flow rate (TWA)^*	0.05-0.2 L/min
Sampling volume (STEL/Peak/C)^*	3 L
Sampling flow rate (STEL/Peak/C)^*	0.05-0.2 L/min
Analytical method instruments	GC-FID
Method reference	OSHA PV2040 (partially validated)
Notes	The Anasorb tubes should be separated and capped after sampling. Tubes should be refrigerated as soon after sampling as possible and shipped cold to the SLTC.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device	Detector tube	Detector tube
Model/Type	Gastec 136LA	Matheson-Kitagawa 8014-157SB
Sampling information (see manufacturer instructions)	1-2 strokes, 0.2-36 ppm range, uncertainty 16% for 1-6 ppm, 8% for 6-18 ppm	1,2 or 4 strokes, approx 0.2-80 ppm rang

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA		REL-TWA		TLV-TWA	1 ppm [1994]	PEL-TWA	1 ppm (3.88 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C	20 ppm (80 mg/m³)	REL-C		TLV-C		PEL-C	20 ppm
Skin notation	Y	Skin notation	N	Skin notation	Y	Skin notation	Y
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes: CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION (LOQ 4.7 ppm). See Appendix A, NIOSH Potential Occupational Carcinogens. See also Appendix G: 1989 Air Contaminants Update Project - Exposure Limits NOT in Effect		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	250 ppm
Carcinogenic classifications: IARC-3, NIOSH-Ca, TLV-A4, EPA-D		Notes: Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: --/50 ppm/200 ppm

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Methyl bromide

NIOSH: Pocket Guide to Chemical Hazards - Methyl bromide

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Methyl bromide. See annual publication for most recent information.
International Chemical Safety Cards (WHO/IPCS/ILO): Methyl Bromide.
EPA Air Toxics Website: Methyl Bromide (Bromomethane). U.S. Environmental Protection Agency Technology Transfer Network.
Garnier, R., Rambourg-Schepens, M.O., Muller, A. and Hallier, E.: Glutathione transferase activity and formation of macromolecular adducts in two cases of acute methyl bromide poisoning. Occup. Environ. Med. 53(3): 211-215, 1996.
Lenhart, S.W. and Gagnon, Y.T.: Health hazard evaluation of methyl bromide soil fumigations. Appl. Occup. Environ. Med. 14(7): 407-412, 1999.
No authors: Methyl bromide. IARC Monogr. Eval. Carcinog. Risks Hum. 71(Pt. 2): 721-735, 1999.
Pohanish, R.P. (editor): Methyl Bromide. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1531-1534.

Last Updated Date : 01/29/2021

SULFUR DIOXIDE†

Chemical Identification
CAS #	7446-09-5
Formula	SO₂
Synonyms	sulfurous acid anhydride; sulfurous oxide; sulfur oxide

Physical Properties
Physical description	Colorless gas with a characteristic, irritating, pungent odor.
Boiling point	14°F	Molecular weight	64.1
Freezing point/melting point	-104°F	Vapor pressure	3.2 atm
Flash point		Vapor density	2.26
Specific gravity	1.434	Ionization potential	12.30 eV
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating	3	NFPA fire rating	0
NFPA reactivity rating	0	NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	2290
Sampling group
Sampler/Sampling media	Silica gel coated with silver nitrate and a glass fiber filter treated with sodium carbonate/glycerol, 2, (200/200 mg) [SKC 226-177]
Sampling time^*	240 min
Sampling volume (TWA)^*	12 L
Sampling flow rate (TWA)^*	0.05 L/min
Sampling volume (STEL/Peak/C)^*	7.5 L
Sampling flow rate (STEL/Peak/C)^*	0.5 L/min
Analytical method instruments	IC
Method reference	OSHA 1011 (fully validated)
Notes	Use this method when sampling for both hydrogen sulfide and sulfur dioxide. Sulfur trioxide and gaseous elemental sulfur can cause a positive interference. The sampling pump must be capable of maintaining a constant flow of 0.5 L/min with a back pressure of approximately 20 inches of water.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device	CMS Chip	CMS Chip
Model/Type	Sulfur dioxide, 0.4-10 ppm range	Sulfur dioxide, 5-150 ppm range
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	5 ppm (13 mg/m³)	REL-TWA	2 ppm (5 mg/m³)	TLV-TWA		PEL-TWA	2 ppm (5 mg/m³)
PEL-STEL		REL-STEL	5 ppm (13 mg/m³)	TLV-STEL	0.25 ppm [2008]	PEL-STEL	5 ppm (10 mg/m³)
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	100 ppm
Carcinogenic classifications: TLV-A4, IARC-3		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: 0.3 ppm/3 ppm/25 ppm

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Sulfur dioxide

NIOSH: Pocket Guide to Chemical Hazards - Sulfur dioxide

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Sulfur Dioxide. See annual publication for most recent information.
ATSDR: Toxicological Profile - Sulfur Dioxide [4 MB PDF, 23 pages]. US Health and Human Services (US HHS), 1998.
NIOSH: Occupational Health Guideline - Sulfur Dioxide, 1978.

Last Updated Date : 01/12/2021

INDIUM COMPOUNDS (as In)

Chemical Identification
CAS #	7440-74-6
Formula	In
Synonyms	indium metal

Physical Properties
Physical description	Ductile, shiny, silver-white metal that is softer than lead.
Boiling point	3767°F	Molecular weight	114.8
Freezing point/melting point	314°F	Vapor pressure	0 mmHg (approx)
Flash point		Vapor density
Specific gravity	7.31	Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	1510
Sampling group
Sampler/Sampling media	Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0]
Sampling time^*	240-480 min
Sampling volume (TWA)^*	480-960 L
Sampling flow rate (TWA)^*	2 L/min
Sampling volume (STEL/Peak/C)^*	10-30 L
Sampling flow rate (STEL/Peak/C)^*	2 L/min
Analytical method instruments	AAS/AES
Method reference	OSHA ID-121 (fully validated)
Notes	Results are provided for the presence and amount or concentration of a specific element or elements. The stated identity of the actual sample contents (such as specific form, valence state, or compound) is based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media	Wipe with Whatman smear tab. [WHA1450993]
Bulk Method	Available

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA		REL-TWA	0.1 mg/m³	TLV-TWA	0.1 mg/m³ [1990]	PEL-TWA	0.1 mg/m³
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	NA	Skin notation	N	Skin notation	N	Skin notation	N
Notes: Not established		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH
Carcinogenic classifications: Not listed		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Indium

NIOSH: Pocket Guide to Chemical Hazards - Indium

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Indium [7440-74-6], and compounds, as In. See annual publication for most recent information.

Last Updated Date : 12/31/2020

ZIRCONIUM COMPOUNDS (as Zr)†

Chemical Identification
CAS #	7440-67-7
Formula	Zr
Synonyms	zirconium metal: zirconium. Synonyms of other zirconium compounds vary depending upon the specific compound.

Physical Properties
Physical description	Soft, malleable, ductile, solid or gray to gold, amorphous powder.
Boiling point	6471°F	Molecular weight	91.2
Freezing point/melting point	3375°F	Vapor pressure	0 mmHg (approx)
Flash point		Vapor density
Specific gravity	6.51 (metal)	Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction	0
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	2620
Sampling group
Sampler/Sampling media	Mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) and filter spacer with Na₂CO₃ impregnated backup pad, in a 3-piece cassette [SKC 225-9001]
Sampling time^*	240-480 min
Sampling volume (TWA)^*	480-960 L
Sampling flow rate (TWA)^*	2 L/min
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments	AAS/AES
Method reference	OSHA ID-121 (fully validated)
Notes	Samples are analyzed gravimetrically. Results will be qualified based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes; no further work on the sample will be performed due to method limitations.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method	Available

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	5 mg/m³	REL-TWA	5 mg/m³	TLV-TWA	5 mg/m³ [1992]	PEL-TWA	5 mg/m³
PEL-STEL		REL-STEL	10 mg/m³	TLV-STEL	10 mg/m³ [1992]	PEL-STEL	10 mg/m³
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes: The REL applies to all zirconium compounds (as Zr) except Zirconium tetrachloride.		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	50 mg/m³
Carcinogenic classifications: TLV-A4		Notes: test idlh notes
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Zirconium, dry, coiled wire, finished metal sheets or strips

NIOSH: Pocket Guide to Chemical Hazards - Zirconium compounds (as Zr)

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Zirconium [7440-67-7] and compounds, as Zr. See annual publication for most recent information.

Last Updated Date : 01/14/2021

YTTRIUM †

Chemical Identification
CAS #	7440-65-5
Formula	Y
Synonyms	yttrium metal

Physical Properties
Physical description	Dark-gray to black, odorless powder. Soft silvery-white metal in bulk.
Boiling point	5301°F	Molecular weight	88.9
Freezing point/melting point	2732°F	Vapor pressure	0 mmHg (approx)
Flash point		Vapor density
Specific gravity	4.47	Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	2602
Sampling group
Sampler/Sampling media	Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0]
Sampling time^*	240-480 min
Sampling volume (TWA)^*	480-960 L
Sampling flow rate (TWA)^*	2 L/min
Sampling volume (STEL/Peak/C)^*	10-30 L
Sampling flow rate (STEL/Peak/C)^*	2 L/min
Analytical method instruments	AAS/AES
Method reference	OSHA ID-121 (fully validated)
Notes	Submit as a separate sample. If the filter is not overloaded, samples may be collected up to an 8-hour period.
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media	Wipe with Whatman smear tab. [WHA1450993]
Bulk Method	Available

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	1 mg/m³	REL-TWA	1 mg/m³	TLV-TWA	1 mg/m³ [1986]	PEL-TWA	1 mg/m³
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	500 mg/m³
Carcinogenic classifications: Not listed		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Yttrium

NIOSH: Pocket Guide to Chemical Hazards - Yttrium

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Yttrium. See annual publication for most recent information.

Last Updated Date : 01/14/2021

URANIUM, SOLUBLE COMPOUNDS†

Chemical Identification
CAS #	7440-61-1
Formula	U
Synonyms	Synonyms vary depending upon the specific soluble uranium compound.

Physical Properties
Physical description	Colorless liquid with a strong, acrid, pungent odor.
Boiling point	7468°F	Molecular weight	238
Freezing point/melting point	2075°F	Vapor pressure	depends upon the specific compound
Flash point		Vapor density	19.05 (metal)
Specific gravity		Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time^*
Sampling volume (TWA)^*
Sampling flow rate (TWA)^*
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments
Method reference
Notes
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	0.05 mg/m³	REL-TWA	0.05 mg/m³	TLV-TWA	0.2 mg/m³ [1992]	PEL-TWA	0.05 mg/m³
PEL-STEL		REL-STEL		TLV-STEL	0.6 mg/m³ [1992]	PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes: CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens.		Notes: BEI®		Notes: soluble compounds, as U
Health factors: See NIH-NLM PubChem.		IDLH	10 mg/m³
Carcinogenic classifications: NIOSH-Ca, TLV-A1		Notes: Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Not listed

NIOSH: Pocket Guide to Chemical Hazards - Uranium (soluble compounds, as U)

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Uranium (natural) [7440-61-1], Soluble and insoluble compounds, as U. See annual publication for most recent information.

Last Updated Date : 01/29/2021

URANIUM, METAL & INSOLUBLE COMPOUNDS†

Chemical Identification
CAS #	7440-61-1
Formula	U
Synonyms	uranium metal: uranium I. Synonyms of other insoluble uranium compounds vary depending upon the specific compound.

Physical Properties
Physical description	Silver-white, malleable, ductile, lustrous solid.
Boiling point	7468°F	Molecular weight	238
Freezing point/melting point	2075°F	Vapor pressure	0 mmHg (approx)
Flash point		Vapor density	19.05 (metal)
Specific gravity		Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time^*
Sampling volume (TWA)^*
Sampling flow rate (TWA)^*
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments
Method reference
Notes
Special requirements

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA	0.25 mg/m³	REL-TWA	0.2 mg/m³	TLV-TWA	0.2 mg/m³ [1992]	PEL-TWA	0.2 mg/m³
PEL-STEL		REL-STEL	0.6 mg/m³	TLV-STEL	0.6 mg/m³ [1992]	PEL-STEL
PEL-C		REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes: CARCINOGEN (Ca): REDUCE EXPOSURE TO LOWEST FEASIBLE CONCENTRATION. See Appendix A, NIOSH Potential Occupational Carcinogens.		Notes: BEI®		Notes: insoluble compounds, as U
Health factors: See NIH-NLM PubChem.		IDLH	10 mg/m³
Carcinogenic classifications: NIOSH-Ca, TLV-A1		Notes: Ca
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Not listed

NIOSH: Pocket Guide to Chemical Hazards - Uranium (insoluble compounds, as U)

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Uranium (natural) [7440-61-1], Soluble and insoluble compounds, as U. See annual publication for most recent information.
Bleise, A., Danesi, P.R. and Burkart, W.: Properties, use and health effects of depleted uranium (DU): a general overview. J. Environ. Radioac. 64: 93-112, 2003.
Bolton, J.P.G. and Foster, C.R.M.: Battlefield use of depleted uranium and the health of veterans. J. R. Army Med. Corps 148: 221-230, 2002.
McDiarmid, M.A., et al.: Health effects of depleted uranium on exposed Gulf War veterans. Environ. Res. 82(2): 168-180, 2000.
Pellmar, T.C., et al.: Distribution of uranium in rats implanted with depleted uranium pellets. Toxicol. Sci. 49: 29-39, 1999.

Last Updated Date : 01/14/2021

METHYL IODIDE†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

METHYL CHLORIDE†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

ETHYLENE

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

METHYL BROMIDE†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

SULFUR DIOXIDE†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

INDIUM COMPOUNDS (as In)

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

ZIRCONIUM COMPOUNDS (as Zr)†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

YTTRIUM †

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

URANIUM, SOLUBLE COMPOUNDS†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References

URANIUM, METAL & INSOLUBLE COMPOUNDS†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References